When a soccer ball is kicked with a vertical speed of 25 m/s its height, h metres, after t seconds

Question:

When a soccer ball is kicked with a vertical speed of 25 m/s its height, h metres, after t seconds is given by the equation h=-5t^2+25t
a) how long after it is kicked is the soccer ball at a height of 30 m ?
b) How long is the soccer ball in the air?

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